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Zetex Semiconductors

ZLDO285 Datasheet Preview

ZLDO285 Datasheet

ULTRA LOW DROPOUT REGULATOR

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2.85 VOLT ULTRA LOW DROPOUT
REGULATOR
ZLDO285
ISSUE 2 - JUNE 1997
DEVICE DESCRIPTION
The ZLDO Series low dropout linear regulators
operate with an exceptionally low dropout
voltage, typically only 30mV with a load
current of 100mA. The regulator series features
output voltages in the range 2.85 to 12 volts, this
device provides an output voltage of 2.85 volts.
The ZLDO285 consumes a typical quiescent
current of only 1mA at its maximum rated
output current of 300mA. A battery low flag is
available to indicate potential power fail
situations. If the input voltage falls to within
200mV of the regulated output voltage then the
error output pulls low. The device also features
an active high disable control. Once disabled
the ZLDO quiescent current falls to typically
11µA.
The ZLDO devices are packaged in Zetex SM8
8 pin small outline surface mount package,
ideal for applications where space saving is
important. The device low dropout voltage,
low quiescent current and small size make it
www.DataSheeit4dUe.caoml for low power and battery powered
applications. Battery powered circuits can
make particular use of the low battery flag and
shutdown features.
FEATURES
Very low dropout voltage
6mV dropout at 10mA output
30mV dropout at 100mA output
100mV dropout at 300mA output
2.85 volt fixed output
Other voltages available
Low quiescent current
1mA quiescent (typ) at 300mA output
Low battery flag
Shutdown control
Surface mount package
APPLICATIONS
Battery powered devices
Portable instruments
Portable communications
Laptop/Palmtop computers
Electronic organisers
Low Battery Flag
THERMAL
SHUTDOWN
LOW BATTERY
COMPARATOR
Vin
Vo
Shutdown
Control
SHUTDOWN
BIAS
CIRCUIT
OUTPUT
DRIVE
BANDGAP
REFERENCE
Cs
Shaping
Gnd




Zetex Semiconductors

ZLDO285 Datasheet Preview

ZLDO285 Datasheet

ULTRA LOW DROPOUT REGULATOR

No Preview Available !

ZLDO285
ABSOLUTE MAXIMUM RATING
Input Supply
Voltage Range
-0.3 to 20V
Shutdown Input
Voltage Range
-0.3 to Vin
Low Battery Output
Voltage Range
-0.3 to 20V
Output Current
Operating Temperature
Storage Temperature
Power Dissipation
(Tamb=25°C)
300mA
-40 to 85°C
-55 to 150°C
2W (Note 1)
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C,IL=10mA,Cs=10pF,Cout=1µF
Parameter
SYMBOL
Output voltage
Output voltage
temperature coefficient
Vo
Vo
T
Line regulation
Vo
Load regulation
Vo
Dropout voltage
(Note3)
Vin-Vo
Quiescent current
Quiescent current
at shutdown
Iq
Iqs
Shutdown control input Iins
current
Shutdown control
threshold voltage
Vts
Output current in
shutdown mode
(Note4)
Output noise voltage
(Note4)
ILs
en
Low battery detect
voltage
Low battery flag
output voltage
Low battery flag
leakage current
Vin(bld)
Vbl
Ibl
CONDITIONS MIN
Vin=3.85V
2.75
Vin=3.85V
(Note 2, Note 4)
Vin=3.85to 20V
IL=10 to 300mA
Vin=3.85V
IL=10mA
IL=100mA
IL=300mA
Vin=3.85V, IL=0
Vin=3.85V, IL=0,
Vshdn=Vin
Vshdn=Vin=3.85V
TYP
2.85
100
13
38
6
30
100
0.55
11
2
Vin=3.85V
low(on)
high(off)
Vin=20V
Vo=Gnd
1.5
50
Vin=3.85V
f=10Hz
to100kHz,
IL=100mA
140
Vo+0.2V
Ibl=100µA,
Vin<Vo+150mV
Vbl=6V,
Vin>Vo+300mV
0.16
0.1
MAX
2.95
2 50
UNITS
V
ppm/ °C
46 mV
66 mV
10 mV
75
200
1 mA
30 µA
10 µA
0.4 V
100 nA
µV RMS
Vo+0.4V V
0.4 V
1 µA


Part Number ZLDO285
Description ULTRA LOW DROPOUT REGULATOR
Maker Zetex Semiconductors
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